What does guard mean in laravel certification?

Just like the title, I discovered the term Guard when reading the document (in Chinese). The document defines it like this: "Guard defines how users implement authentication in each request", and there is a "Customized guard" chapter at the end, and then I'm confused as to what this guard means.
Does it mean multi-user authentication? Guards with different names are isolated and have different certifications? ?
http://laravelacademy.org/post/3074.html#ipt_kb_toc_3074_23

Also, what does provide mean? . . .

Reply content:

Just like the title, I discovered the term Guard when reading the document (in Chinese). The document defines it like this: "Guard defines how users implement authentication in each request", and there is a "Customized guard" chapter at the end, and then I'm confused as to what this guard means.
Does it mean multi-user authentication? Guards with different names are isolated and have different certifications? ?
http://laravelacademy.org/post/3074.html#ipt_kb_toc_3074_23

Also, what does provide mean? . . .

In fact, you can understand it as Guard or Provide. A plug-in for a specific function.
Laravel is a foreigner’s product, which pays attention to elegance, so it makes different things into independent and beautiful things (seems to be a linguistic error in explanation)
Then let’s talk about the official usage of these things. .
Guard, just like the Chinese meaning this time, means guard, that is, the gatekeeper. .
Its function is to process an authentication to determine whether each request or call has been logged in or allowed to pass. In fact, this middleware can also be implemented. However, as an elegant framework, it naturally has elegant classification. .
You can log in with a password to create a Guard, log in with QQ, and create another Guard. Any login form you want to verify, or interface verification, can be encapsulated into an independent Guard and called. .

As for provide, it is not exclusive to authentication. It is a relatively basic and core thing in Laravel. The official translation is called service provider.
There are only a few agreed-upon methods in it, roughly. The boot executed when running this service, and the register and hooks for registering some things for this service. The main purpose is to provide various services for the framework.
For example, if you create a formatted output service, when this service is executed, it will convert all non-character values ​​in the output json into character types. . The service is then registered under the output object. It's called ShowMyJSON, and you can use it directly when outputting. .

I feel like you will be confused. . . Laravel is really hard to understand when you are new to it. Just take your time. Just like assembling a robot. Whatever you need, just install it somewhere.

Please take a closer look at the documentation on the official website: https://laravel.com/docs/5.2/authentication#adding-custom-guards

Or come to my website https://laravist.com/ for in-depth explanations of many knowledge